Free Online Chromatic Tuner
Tune any instrument to any note. Detects all 12 chromatic pitches across multiple octaves with real-time cent-deviation feedback. Use for alternate tunings, non-guitar instruments, or ear training.
What chromatic mode unlocks
One tuner, every tuning, every instrument.
Alternate tunings
DADGAD, Open G, Open D, Drop C, Nashville, half-step down — any tuning that isn't standard. Tune string by string, referencing the target notes for the tuning you want.
Non-guitar instruments
Violin (GDAE), mandolin (GDAE), banjo, ukulele, harmonica, brass instruments, and voice. If it makes a sustained pitch, the chromatic tuner reads it.
Ear training
Hum or sing a note, then check what you produced. Train interval recognition by humming a target and seeing how close you got.
Intonation checks
Play the open string, then play the 12th-fret harmonic and fretted 12th. All three should read the same note — if the fretted 12th is sharp or flat, intonation needs adjustment.
How it works
MIDI math behind the needle.
Every musical note maps to a frequency through the equal temperament formula: f = 440 × 2^((n − 69) / 12), where n is the MIDI note number and 440 Hz is the reference pitch (A4). This tuner reverses the formula — given a frequency, it solves for n, rounds to the nearest whole semitone, and shows you cent deviation from that target.
That's why chromatic mode is universal. It doesn't need to know what instrument you're playing — it just identifies the closest note in 12-tone equal temperament. A4 stays at 440 Hz whether you played it on a guitar, a violin, or sang it.
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Frequently asked
What is a chromatic tuner?
A chromatic tuner detects any of the 12 notes in Western music — C, C#, D, D#, E, F, F#, G, G#, A, A#, B — across multiple octaves. Unlike a guitar-specific tuner that only listens for E, A, D, G, B, and high E, a chromatic tuner tells you exactly what note you're playing and how far it is from the nearest semitone.
When should I use a chromatic tuner instead of a guitar tuner?
Use chromatic for: alternate tunings the standard tuner doesn't cover (DADGAD, Open G, Drop C, Nashville), non-guitar instruments (violin, mandolin, banjo, harmonica, brass, voice), ear training, or when you want to verify which note you're hitting before tuning to a target.
How accurate is it?
Same YIN pitch-detection engine as the guitar tuner. Accurate to within a couple of cents in a quiet room with a single sustained pitch. The chromatic mode uses a wider frequency range (35 Hz to 2 kHz) — covers bass low B up through guitar 15th-fret high E and most vocal range.
Does it work for singers?
Yes. Hum or sing a sustained note. The tuner shows you what pitch you're producing in real time. Useful for warm-ups, matching pitch to a song's key, or training your ear to recognize specific notes. Pick a quiet room — voice tuning is more sensitive to background noise than instrument tuning.
Why does the note jump octaves while I play?
Two reasons. First, harmonics — a plucked string has strong overtones at 2x and 3x the fundamental, and pitch detection occasionally locks onto one. Second, the pluck attack contains many frequencies before the fundamental stabilizes — wait a second after picking and the note will settle.
Does the tuner support flats?
The display uses sharps (C#, D#, F#, G#, A#) since most guitar players think in sharps. Enharmonic equivalents: C# = Db, D# = Eb, F# = Gb, G# = Ab, A# = Bb. The frequency is identical — just two names for the same pitch.
Tuning sounds right, but the guitar still doesn't?
If notes ring true at the nut but go sharp or flat up the neck, that's an intonation problem — and a tuner alone won't fix it. A proper setup adjusts saddles so every fret plays in tune. Based in Pikeville, NC, serving Goldsboro and Wayne County.